Short Shaft 15 "       Sailboats with movable brackets   Small Jon Boats   Small Sailboats   Inflatables   Gheenoes   Canoes   Small Boats that Have a 15-17" Transom

Long Shaft 20 " Please note: The following information given on this  page is to assist you in measuring your transom  Small Jon Boats   Sailboats   Pontoons   Small Boats that Have a  18-21" Transom

The information below was gathered from many informative sources but mostly from

Trailer Sailor Articles & Reviews

The "Outboard Boater's Handbook" suggests that a good rule of thumb for motors is 1 HP for every 100 pounds of boat to be moved.